How to use the composeml.data_slice.extension.DataSliceFrame function in composeml

def _slice_by_column(self, df):
        """Slices the data frame by an existing column."""
        slices = df.groupby(self.window_size, sort=False)
        slice_number = 1

        for group, ds in slices:
            ds = DataSliceFrame(ds)
            ds.context = DataSliceContext(
                slice_number=slice_number,
                slice_start=ds.first_valid_index(),
                slice_stop=ds.last_valid_index(),
            )
            setattr(ds.context, self.window_size, group)
            del ds.context.next_start
            slice_number += 1
            yield ds

def _constructor(self):
        return DataSliceFrame

start (int or str): Where to start the first data slice.
            step (int or str): The step size between data slices. Default value is the data slice size.
            drop_empty (bool): Whether to drop empty data slices. Default value is True.

        Returns:
            ds (generator): Returns a generator of data slices.
        """
        self._check_index()
        size, start, step = self._check_parameters(size, start, step)
        df = self._apply_start(self._df, start)

        if df.empty: return
        if step._is_offset_position:
            start.value = df.index[0]

        df = DataSliceFrame(df)
        slice_number, stop_value = 1, df.index[-1]
        while not df.empty and start.value <= stop_value:
            ds = self._apply_size(df, start, size)
            df = self._apply_step(df, start, step)
            ds.context.next_start = start.value
            if ds.empty and drop_empty: continue
            ds.context.slice_number = slice_number
            slice_number += 1
            yield ds